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An Alternative Method of Obtaining Open Hole Logs in Horizontal Wells
- Examples from the Mississippian
5/15/2012
Rick Reischman – ThruBit Houston
Don Herman – ThruBit Midland
www.thrubit.com
Mississippian and Arbuckle Workshop – October 31, 2012
Rick Reischman
ThruBit – Houston, TX
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Objective: To obtain high quality open hole log data after drilling
with minimal risk and cost in horizontal wells.
• Reservoir delineation (Porosity, Lithology, Stress)
• Completion optimization
How: Conveying a specially designed set of slim hole logging
tools by pumping them down through drillpipe and a PortalTM bit to suspend sensors into open hole. Data is then acquired in memory as the pipe is tripped out.
Benefits:
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ThruBit Areas worked
Service Points:
Houston
Tyler
Midland
Oklahoma City
Brighton, CO
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Four Levels of Deployment /Acquisition
Wireline Open Hole
Real Time
First Attempts
Slim Holes
Sticking conditions
Wireline thru Drillpipe and Bit
Real Time
Single Zones Near TD
Bypassing Ledges
Memory Logging
Difficult Wells
Multiple Intervals
Deviated Wells
Adverse Conditions
Memory Logging – Pump Assisted
Horizontal Wells
Horizontal Wells
Alternative to LWD
& Pipe Conveyed
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BHA Components
PortalTM Bit - Sizes 6” – 12 ¼”
2 1/2” (2 3/8” drift) Pass through diameter required through all tubulars
• Deployment/retrieval of the logging string at any time.
• Rotation and Circulation can be maintained at all times.
• Lost circulation material can be added.
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SureLogTM Logging Tools TMG TBN TBD TBR TBS
(Memory or Real Time)
Operating Milestones: Max MD > 24000’, Max Dog Leg = 31deg/100’ Max Inc = 103 deg Max BHT=317
• Maximum Outer Diameter 2 1/8”
• Minimum Hole Size 4”
• Maximum Hole Size 14”
• Temperature 300° F
• Pressure 15,000 psi
TBN – Thermal Neutron
TBD – Density, PEF, Caliper
TBR – Array Induction
TBS – Sonic (monopole 6 receivers – compressional and shear)
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SureLogTM/Q-String Comparison - South Texas Vertical Well
Conditions:
• BS=6”
• OBM/16.8 ppg
• No Conditioning
between runs
• Real Time Wireline
Level Conveyance
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Horizontal Memory Logging Video Level Conveyance
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Typical Horizontal Well Logs
Niobrara
Mississippian
Questions:
In zone or Out of zone? Porosity/sweet spots? Naturally Fractured?
Ideal placement of stages/perfs ?
Eagle Ford
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Bakken - North Dakota horizontal well Depth Scale: 200’/division
• Caliper data – hole enlargements
• Variations in Porosity and Lithology
• GR is of little use for zone delineation
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Oklahoma Woodford Shale Example Horizontal well: 100’/division
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Granite Wash - TX Panhandle horizontal well
• Significant stratigraphic changes.
• Log data has a significant impact on completion design.
• GR is of little use for correlation or zone delineation
Depth Scale: 100’/division
Stage 1 Stage 2 Stage 3 Stage 4 Stage 5 Stage 6
Stage 1 Stage 2 Stage 4 Stage 5 Stage 3
Geometric Designed
Frac Stages
Potential Optimized
Frac Stages
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Mississippian Example 1 – Western Oklahoma
• Limited Gamma Ray response throughout the lateral
• Variations in Porosity will influence completion design
Depth Scale: 100’/major division
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Mississippian Example 2 – Western Oklahoma
• Gamma Ray does not clearly indicate porosity/lithology changes
• Variations in Porosity will influence completion design
Depth Scale: 100’/major division
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Sonic Applications
• Compressional/Shear velocities
• Primary/Secondary Porosity
• Rock Properties Poisson’s ratio/Young’s Modulus
• Brittleness (SPE 115258)
• Qualitative fracture indications
SureLogTM - Memory Quad combo Toolstring 6 Receivers
Slowness Time
Coherence
Processed Results Shear
Compressional
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Predicting Frac Geometry using Borehole Stress Data
Stress from Sonic Scanner
Microseismic events
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Mississippian – Southern Kansas Horizontal well: 100’/division
Brittleness
Frac Gradient
Geo-FracTM – Stress Profiling
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Qualitative Fracture Identification – Sonic VDL vs Image Interpretation
Depth Scale=100’/division Mid Continent Shelf Carbonate
Black=Open Continuous, Green=Open Lith Bound, Aqua=Open Partially healed
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Sonic VDL in the Mississippian – N. Central Oklahoma horizontal well
• Typical interval with open fractures. Note attenuation and discontinuities in the shear portion of the VDL.
• Healed fractures are not detected.
Depth Scale: 10’/division
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• The SureLogTM tools, PortalTM bit, and deployment technique allow for the successful acquisition of open hole logs in horizontal wells at minimal risk. – Rapid retrieval of logging tools and sources if pipe becomes stuck
– Full Circulation and rotation of pipe throughout the procedure
– Wireline never exposed to open hole.
• Use of wireline enhances reliability. – Tools only deployed after bit is in position and well is deemed ready.
– Down log recorded – continuous monitoring of sensors before being released
– Down log can be used as a secondary depth reference
• Rig time and acquisition cost savings with less operational and LIH risk compared to LWD and other logging techniques.
• Porosity and sonic data can optimize the completion by allowing the zones of similar properties to be grouped, resulting in improved frac designs and maximized productivity.
Conclusions
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Questions